Note 2 - Securities - Amortized Cost and Fair Values of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Jun. 30, 2017
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Amortized Cost Basis	$ 3,087
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	3,097
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Amortized Cost Basis	20,787
Available-for-sale Securities, Debt Maturities, Year Two Through Five, Fair Value	20,645
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Amortized Cost Basis	27,462
Available-for-sale Securities, Debt Maturities, Year Six Through Ten, Fair Value	27,235
Available-for-sale Securities, Debt Maturities, after Ten Years, Amortized Cost Basis	22,115
Available-for-sale Securities, Debt Maturities, after Ten Years, Fair Value	21,735
Available-for-sale Securities, Debt Maturities, Single Maturity Date, Amortized Cost Basis	73,451
Available-for-sale Securities, Debt Maturities, Single Maturity Date	72,712
Available-for-sale Debt Securities, Amortized Cost Basis	146,097	$ 141,411
Securities, available-for-sale	144,028	142,086
Held-to-maturity Securities, Debt Maturities, after Five Through Ten Years, Net Carrying Amount	527
Held-to-maturity Securities, Debt Maturities, Year Six Through Ten, Fair Value	527
Held-to-maturity Securities, Debt Maturities, after Ten Years, Net Carrying Amount	3,497
Held-to-maturity Securities, Debt Maturities, after Ten Years, Fair Value	3,521
Held-to-maturity Securities	4,024	4,259
Held-to-maturity Securities, Fair Value	4,048	4,329
U.S. Government-sponsored Mortgage-backed and Related Securities [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	72,468
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	70,589
Pooled Trust Preferred Securities Subject to Mandatory Redemption [Member]
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	178
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	727
Available-for-sale Debt Securities, Amortized Cost Basis	178	155
Securities, available-for-sale	$ 727	$ 532